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A humanized murine model, demonstrating dominant progressive hearing loss caused by a novel KCNQ4 mutation (p.G228D) from a large Chinese family.
- Source :
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Clinical genetics [Clin Genet] 2022 Aug; Vol. 102 (2), pp. 149-154. Date of Electronic Publication: 2022 May 28. - Publication Year :
- 2022
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Abstract
- The pathogenic variants in KCNQ4 cause DFNA2 nonsyndromic hearing loss. However, the understanding of genotype-phenotype correlations between KCNQ4 and hearing is limited. Here, we identified a novel KCNQ4 mutation p.G228D from a Chinese family, including heterozygotes characterized by high-frequency hearing loss that is progressive across all frequencies and homozygotes with more severe hearing loss. We constructed a novel murine model with humanized homologous Kcnq4 mutation. The heterozygotes had mid-frequency and high-frequency hearing loss at 4 weeks, and moved toward all frequencies hearing loss at 12 weeks, while the homozygotes had severe-to-profound hearing loss at 8 weeks. The degeneration of outer hair cells (OHCs) was observed from basal to apical turn of cochlea. The reduced K <superscript>+</superscript> currents and depolarized resting potentials were revealed in OHCs. Remarkably, we observed the loss of inner hair cells (IHCs) in the region corresponding to the frequency above 32 kHz at 8-12 weeks. The results suggest the degeneration of OHCs and IHCs may contribute to high-frequency hearing loss in DFNA2 over time. Our findings broaden the variants of KCNQ4 and provide a novel mouse model of progressive hearing loss, which contributes to an understanding of pathogenic mechanism and eventually treatment of DFNA2 progressive hearing loss.<br /> (© 2022 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.)
Details
- Language :
- English
- ISSN :
- 1399-0004
- Volume :
- 102
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- Clinical genetics
- Publication Type :
- Academic Journal
- Accession number :
- 35599357
- Full Text :
- https://doi.org/10.1111/cge.14164